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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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Liquid damage - Can't power on when unplugged

I've got a MacBook Pro that received a coffee bath. Everything seems to be functional aside from one odd behavior: when the computer is entirely off, I cannot power the computer back on unless I attach the MagSafe adapter. Once the computer is on I can disconnect the power and it runs fine. It even displays the battery percentage in the OS. Taking the computer apart, I noticed that the board that is part of the battery seems to have been soaked with coffee.

So my question is this: Given the behavior, does anyone here have a guess as to whether it might be more likely to be the logic board or the battery?

I can purchase a new battery and return it if I don't need it (for a refund, less return shipping and a 20% restocking fee), or I can go for a $200 repair service that may just tell me I need a new battery. I'm leaning toward trying the battery first...

Thanks!

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Unfortunately, it sounds like the motherboard is the issue. (from what I know), the circuitry in the battery only regulates voltage, and it's up the the motherboard circuitry to allow that voltage to come through to the system power, so in technical terms, it sounds like the regulator (ISL6259) for the voltage rail PPBUS_G3H only works when it's in a S0 power state.

That being said, I can only assume so much form the symptoms of the laptop, and without having the laptop in front of me it is hard to tell, so it might be best for you to take it to a 3rd repair shop that offers a no-fix, no-fee system that also does component-level motherboard repair. That way, then can isolate the issue for you, and if the issue is in the logic board, they can fix it for much cheaper than the cost of a replacement.

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2 Comments:

OK, thanks for the info (including the technical bit). I'm sending it in to a company that offers a no-fix, no-fee repair service.

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Okay, hope it goes well!

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Kyle Combes will be eternally grateful.
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